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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5ecf6b24886ca7ecdff1d7d104979d57c38305be7ad492646856c9c1dd4e76' 
  AND token = '8Nq1MFCkaodCQFJUZFd3H5fYLfeABfU1w9fyXSEYiWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}